Question

According to the central pollution control board, particles that are responsible for causing great harm to the human health are of diameter

• A. 7.5 micrometers
• B. 10.0 micrometers
• C. 5.0 micrometers
• D. 2.5 micrometers

Answer 1

The correct option is D 2.5 micrometers

Particulate matter causing air pollution is differentiated into settleable (larger than 10 micrometers) and suspended (less than 10 micrometers) particulate matter. According to the Central Pollution Control Board (CPCB), particles of 2.5 micrometer and lesser diameter are most harmful to human health as they can pass deep into the lungs causing breathing and respiratory problems.